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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4adb8245c9768982c6344d4ec0879f96ab909e3e642f63d54056aaad0efb2df' 
  AND token = 'qEoxr0BggX9zbjHpsnOzzWM404U7keNHGIXu4SKU6FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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