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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9a167ef98c55c09f88fd28afbee6465f8744d71b8e89bdfb64fb4537f08d8f' 
  AND token = 's3iHU5eH3OtxtSW8iDBJNiFiIdM3a4przsaatdIzU5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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