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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c1ebc2acfa0cdda2e00a412813e1fe48d33ad3f00f37541addf1ff0d98db18' 
  AND token = 'kT3JdMxiAnWmzG0I9gRl+9U26QNEM0ZGjr0HB19Nyxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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