SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b5c0d193c56528b6f6f1fc292d89023422cf514f67331b73b5158a4c87df5a' 
  AND token = 'VME7hpwxS2FDK/BlnHsjqRMImD2t98uNFP5vmFqpicM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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