SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cf270148a51172de17fe1bee153ac1f4d1cce205975293662418bd14e0abdd' 
  AND token = 'wmbD8/A4PW0MGi8IYdsVawmjd7Vh5tJwqZgzUPFQxms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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