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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae953fe88a93ff062b3b57d0f8fcbdfe2b53aaeb202ed3fb7f38c675533d0b7' 
  AND token = 'dOz/3+0EGBro/ntLUDkOgYWfiFNir6Wkd44F0a3dF4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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