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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb614c606f53420d835f2122b9123b76e46e8e1ecc184a79590ab8b6a4c1700' 
  AND token = '3oluos7G92FpaN+2UP9P8Ydgi0F5DJTlsR//0BZ6b5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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