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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18545aa77227f26f9743e599c0d53f6b4be6d1bd2e80c29dcae0d40ed96ebf63' 
  AND token = 'BqSOfsufJov4Il3akcl9nfo17ZcC+ydMiUFLn0gTDaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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