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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fba0898f7e465b3e34d30e79fb1bf3de89e08cafed8ab8b265c4ea6a8d908a' 
  AND token = '5Vq/g7Mn0lZI9WlxaE7ktdMp5swdlIO2vonFGv8IFOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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