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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d5496288ae1e55b464ab8e5676c2ce61d88487f8a8c34a94430d9a22fd2077' 
  AND token = 'kS+h2YBF55/86HwIYd7a60BW5unZyjYslEyUX93ThWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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