SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09368b96ca0596860b58753ae8271b0bf4529a2a723123be13374f3b8d5614b4' 
  AND token = 'Zn2dc1JiUIbIAuK+ug0hXwD0Cwa7V59mBzel7++99SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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