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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc8dcb55f3351fb898e97d282eeb5b89052f342dcea10e3331b8f061b6b7e91' 
  AND token = 'Iq8SYp+C76Qr6JVwqUJ2MV+bfbvpO1pk2GsRUJ7WQHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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