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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdae0f73bde8a181ac77ab3da3daf1b6bef6bc67fa343dc3c4f80d0b7c125400' 
  AND token = 'OMLb2s2vzZqchNc86qz+qq6Umcvddyfi5PBaEvmSisY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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