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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c454ac6b169ece96a81a600c1ed5a05b6c3b12fe99cdee45c3387b19881a84' 
  AND token = 'saqSeVopOzUjdLAoSfFhqV7jfpNXkE9znj9ADomnAzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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