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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aefcf43c4867fd4b1100aa36ed2e8fd936e49ad9d7789d85edabe904a2f6d4c' 
  AND token = 'PcLiixslelQBwdcbdW6j3bgF75FO9DvvrdKBO7AzClo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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