SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f8b3073f8599f29ef3103086253c780f79b66b2883d774d17edfb69714e8be' 
  AND token = '//SNZQaVobez+TLnqoTwZC8H9Plm/gsuLNKaGYhg5i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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