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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7305410ca411ea40ca812934872064bdd6822e7add3318710da45705f5c425' 
  AND token = 'FnJNd49Xb8S1qi4EcmHZhiH7Ia9jvdoAp7Nktbok0fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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