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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40475f72226c5cde76efdf8f3b3ab1749e009fc3406dcb13b5cc2fd6cf6e1e4' 
  AND token = 'h6YzHrZcOjaoAHdYDSQh592B/4DpRe5RQJYvwnQ6cGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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