SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67160cce96b6d46c2648f31a78bec3244005b14d435ca15209dae8b7cf434f35' 
  AND token = 'P+uCm0uEzoSEOeYJZpQ3eVX+erokEhBIPGEUwn2viwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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