SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b5b40f66d78ed896bdeed7ebc46c176fbfd20989aa839799fe1fa5ed1e6942' 
  AND token = '+YQzvTJHiJniVjpbWuukVt1zhqTFkOhivgiKoaXkfRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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