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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0a67f45d39179c2ef9a37da95c86725921ddf646e15f93f7e56e111f6ebdc7' 
  AND token = 'rpD3mT2MCUi8le318znBm+Qhbz8yMZDuGEpSffouTZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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