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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f76c0bb98921c12cf7d1730b139588e5beb3861b6b122e77f72fb8a7b2497f' 
  AND token = '4lDaa7wFkd2A2mp4OQe/cB/Ier62AFDq9wXwYloAHfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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