SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92acbf29742efc3f1b233ce31547984ec751493bd9b2e9efe71a785986f65cdc' 
  AND token = 'Zrg9XY+UdOJA2VKmKsEvQL8zx2qIKUfyUz9UF0ypIjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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