SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce3185525987449c266778a564e2599397430315a336068c14d1bb346defc0f' 
  AND token = '/WXU2Quatsk/gdw6YLzTwRHcoO0p9Px8KrfvmA/ROBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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