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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38a7e66773def87db963e972c37454ecef718a4355eb83f91228d6ef40c1139' 
  AND token = 'TQPa60cELzPDtjZZtF+A29ISX0nVxBwMpd4CHN+srT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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