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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae0cabe2ea833f6fbd0788b56064f4a64e9bc65d5343b607eeb9900d85b8742' 
  AND token = 'KpZQmj+2qdY9/vCz9ei0shTML9l9Pt2psGj63zeSlbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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