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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e8eeb384c3d981a9912e601149968e99630ffe72f5e5bbde69e304261c925d' 
  AND token = 'UYbyjd+4WHMNtVsO6ErV3cb2stRylGHUs+z8o7pA1jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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