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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e506439e6bee4a716199db0bbe57c377c0bb9607ddd50b9be636c8eebd09c66e' 
  AND token = 'h85JcC62B7qHvQB4MSul31hMorATDlOBCXc5OdqMefA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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