SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e6abcd695d41163ec75f35e3009ed3a6749d658d25ca6e753a740919281dea' 
  AND token = 'ugomYgbkQjztwPc58kmCFpzZgNV1sES2fC/nVwsq3JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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