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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20da9dc750430b5fe3225a515e7bcc784774fac705927128ceba5d1d88211c5' 
  AND token = 'A4WQBn1VEMD468lxmj7851kpN9GOq2oASP76mbaxg94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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