SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2940b9cd7fb877d14a2be20266f108e52d91a9abfd9e4cc5b89adfed4e5f436' 
  AND token = 'ZusX6Mgmc3ICChKKOoEPYghFRrlcGZB0lfd5wPTzd34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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