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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b99e73d0ebbd22681f57bc6c29f993c184faf59eab8849ae1d69c26f6004f47' 
  AND token = '8istRvWqGekmJeIuhh/ULdI3184WdorDGG82+sQirSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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