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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45f13fa00a8808d3e656d24534b1be3db602a792107268f4d8a8d38d6a34282' 
  AND token = 'QM2JIpT6C3OlEFfl8VUxiRwRyofjPD5zi5mtKMlOMlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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