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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763fd9b796be0c52ce5f6f48fb36af6a9f8c60a3de5c080e0650c9f223009e51' 
  AND token = 'X0bnUDglBn7DDVl9kbKsQmbiT5wbpQF3XcbXkh0rGjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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