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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43bb8c8da6306dc98ea35215b0fdffe5339738ec42d052ce577b31d24fdca6d' 
  AND token = 'UkwtNxekO0mo3ce8mAo2IGAjr0KX01Hm64V/9gDoTq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00354

JSON explain

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