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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577717c580a0dce546a7960722c45cc14446d730607fcfece763110782f3022d' 
  AND token = '0yJDHE7YRB+QA2CAze3L/zc5NFNiK06jcE7aGQ91EQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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