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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae50387bdc130ff93ecf1ab21ce286598fdac62cf724800a15a28f66efcd3dd3' 
  AND token = 'UTUVr5nkR1ydtf99AMGhK7XFGqk3evfhiPK2cT6C8iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}