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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eac0591d107b204afedb7941915348f893fc510a87820a06e82e3c81c060d7c' 
  AND token = 'Vrx9oy+54G7oAP/EAlqeEKas/EQUlLTpr1F4ezFveH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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