SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978c2d984092fdb0af162bd100d467899f43777cce381dae1a2f7c06af3ef7da' 
  AND token = 'uvnKTTYpGd4RrAOhEoV6N/gWqQ//aSKuPNLsBfJ/J3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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