Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c148039710f80f24f280d7376c3d84540362797d65d043dfc9a69388e8c5ff2f' 
  AND token = 'OrIZfArZppOTfEZsgYrFOw5ReNiygtMj68gu9asA3Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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