SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415152a6f0cd4ae7c8fb0f7b796101ad1bab89bdcc2da7035556bdab6877672e' 
  AND token = 'HuX1VKgRXO3Dt9wUDhCp7Zw0qEQoIAYI+jEDSc9YmWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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