SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3413823d134b5eb1683d41af88be9455404bd07a7139727d26cbcce0436155b5' 
  AND token = 'sGPB5Tc/1JgwRWht2B+PGxpzZty/8SFjh4KW11xo8Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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