SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabf63d1a72d39f63b8d787aa7442a95945a4698a8d4281f098579ae8e2d6b6f' 
  AND token = '2RdPrJaCvrScEMFXHBEGV/QkssgfiiUhqBOuLq2pV5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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