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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce51425e518b89c69f0cde3a3695588561b6a037a064e10f0d765b612fa057c7' 
  AND token = '9SGPnjKsBJTSEdyjdT+iL8MVJRWOP4g6mmbuIZE4Yj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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