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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a0d437a65b42b6579583c35cc892536dc3b1c9e83b2c691ac5280dcf724aeb' 
  AND token = 'bzf6l6+55o9Qx0JoAT8sUDkCnUuI9hGWSVVuABgnf1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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