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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87b205f240e63d7e7f2e291084c385d9b670c57d73f80ceade5c145096dcd33' 
  AND token = 'XOCkKUVXciggcHQq4wyfzrkJ80i4k+55mEVo5b/VSKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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