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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235f0b1552e5c28c7c98fafe730f4c01948195311b67e54c527958bb28861ccf' 
  AND token = 'z06r63kwU9zQr/CllD9QouW9dVzXyIozuxV3RyYKXoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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