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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb24071bacab0a530c58701423c60a4aaa9c6c786977580a64081c6d07ae3129' 
  AND token = 'dvWCJY/ig1l94j1RYLbje7i1Amd8bL9nKDI6TJjuVtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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