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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c5e3f76cdebe5623ca2395fd98d639ea1c36411bc8438cac0926f28f643b7b' 
  AND token = 'SvBaAwacsj/Gc9qvYxsq4f06vMFWb4wjtTbmzO6VJ2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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