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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4be88c751f3d8ccc9a819885c0a984d93ae6fa8a2b51434e763057ade06cc24' 
  AND token = 'EZS9vv7I9NSSlfu9oM60M0Qx9YtcBENQ6EIDsJqP8sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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