SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628825378fbbc059b820bb95725f39a10884060c3b1543fbc7637f914e48abff' 
  AND token = 'M11pUeZVYjEmwBtOmVUDrFZO5HLXdQii2/5lqSYxB1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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