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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d40580ac00d6377263707b724dc10bdb734c90396a66c986bb7e7534913361a' 
  AND token = 'oJ5dgxVZLeMOVDO+K/BKHcSQ6Tt023EHn0ie/t+dLHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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