SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ee1a53c9b4cae5b84a2375272b3562de4eb8df8d6a1172ebbc858d87749c92' 
  AND token = 'HsTmHMsX+WDqqfBvyP0dlow9lKXPYr70+czFy4+3U/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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