SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5225aaac22cce7b1e69428a771cdbd8becfa3c94b1a15a3466548f3f478055' 
  AND token = 'rEiFRvWh6QZw8Rl+VYBKadaSgxam3KOgcJSR/ukADhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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