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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f542550ba040ed932194cda45b62b361844532a113ddb2bb7443432634c0b26' 
  AND token = 'y4KzcUp/Kv8Hxj34fBO3JC6+zAzs923l6w8n+7coGVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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