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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f902be56cce684fbcb6067e4908b7eeadccebc59162ea7a20bc3bca7863acf80' 
  AND token = 'XN4WU/RcRGD3wZjRmRA9ZYURK5KXEtjP2JQfpV8GtO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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