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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e7bb5f1d652614c0773082f0d8cd52a53a41361d7daff27fb4f5904b6ad3f8' 
  AND token = 'pLICvc2xuu+HrU5rykEYO7IH8uS3uFteHjPIOuy+A3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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