SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfac7df55cb5c2ccb5c1454076825f0ba4387b0fbb24a01360dd15151943a866' 
  AND token = 'mPZSG0oQpgxK8zJmlV3eLrZgc5i0aOquiyV+VK5zCWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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