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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54aed40755885d2f7a3aa0d7d26369dc3c7a8fe4e61daaba33fbd8d7923ba73f' 
  AND token = 'HTz7xnI6rHC0eXSxb1fGyndsXShA4noASuspfz8XxDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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