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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9057c9c30cd7543e0ab0a514620561ef3b471b29231bbd9a9106cdf359103e99' 
  AND token = 'NPwK53CDRYMes6SG4CARXc5YQW1k78a4A6UnNYwfcV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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