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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afc348342e9e8768622cc846e0b7a00314efefc4ad70eb813a23f9a24ab4715' 
  AND token = 'xwDn70JMl/2MTSv+JM6MS0Cmtp+fchIehqGnVbW9BEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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